81164 has 12 divisors (see below), whose sum is σ = 144144. Its totient is φ = 39984.

The previous prime is 81163. The next prime is 81173. The reversal of 81164 is 46118.

It is not an unprimeable number, because it can be changed into a prime (81163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (12012).

2⁸¹¹⁶⁴ is an apocalyptic number.

It is an amenable number.

81164 is a deficient number, since it is larger than the sum of its proper divisors (62980).

81164 is a wasteful number, since it uses less digits than its factorization.

81164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 302 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 81164 is about 284.8929623560. The cubic root of 81164 is about 43.2966685260.

The spelling of 81164 in words is "eighty-one thousand, one hundred sixty-four".